| 摘要 |
PROBLEM TO BE SOLVED: To provide a technique capable of achieving reduction in the power consumption of an electric vehicle.SOLUTION: A power supply system includes: a main battery 3 supplying electric power to a travel motor; an accessory battery 4 supplying electric power to accessories; and an auxiliary battery 5 temporarily storing electric power generated by a photovoltaic power generator 9. The power supply system includes a first power supply device (DC/DC converter) 6 supplying the electric power of the main battery 3 to the accessories and the accessory battery 4; and a second power supply device (DC/DC converter) 8 supplying the electric power of the auxiliary battery 5 to the accessories and the accessory battery 4. If a power remaining capacity of the auxiliary battery 5 is smaller than a predetermined auxiliary-battery-residual-capacity allowable value, the first power supply device 6 of the power supply system outputs a first voltage higher than an output voltage of the accessory battery 4 and the second power supply device 8 thereof outputs no voltage. On the other hand, if the power remaining capacity of the auxiliary battery 5 is equal to or larger than the auxiliary-battery-residual-capacity allowable value, the first power supply device 6 and the second power supply device 8 each output a second voltage lower than the first voltage and equal to or higher than the output voltage of the accessory battery 4. |
